noun
sleepyhead; oversleeper
A mildly teasing noun for someone who habitually sleeps late or oversleeps. Often used in casual, friendly contexts.
See also: 寝坊
彼は大の寝坊助で、毎朝起こすのが大変だ。
He's a real sleepyhead, and it's a struggle to wake him up every morning.
寝坊助の私には、早起きは無理だ。
For a sleepyhead like me, getting up early is impossible.
寝坊 is a more common and neutral term for oversleeping or a person who oversleeps. 寝坊助 is a slightly more colloquial and affectionate variant.
Compound of 寝坊 (ねぼう, 'oversleeping') and the suffix 助 (すけ), which often adds a familiar or slightly teasing tone to personal traits.